LHCb Semileptonic Asymmetry

Size: px
Start display at page:

Download "LHCb Semileptonic Asymmetry"

Transcription

1 CERN A recent measurement of the CP violating flavour specific asymmetry in B s decays, a s sl, is presented. This measurement is based on a data sample corresponding to an integrated luminosity of 1 fb 1 of pp collisions at s = 7 TeV, collected during the 11 run of the LHC. The result is a s sl = (.4±.4 stat ±.33 syst ) 1, which is the most precise measurement of this quantity to date and agrees with the Standard Model prediction. 14th International Conference on B-Physics at Hadron Machines, April 8, 13 Bologna, Italy Speaker. On behalf of the Collaboration. c Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

2 1. Introduction Precision measurements of flavour observables offer a possible window to new physics, that is complementary to direct searches for on-shell production of new particles. Thanks to the large b b cross section at the LHC, we are entering a new regime in sensitivity with these studies. The B s sector in particular is not accessible by e + e colliders operating at the ϒ(4S) resonance. Since the flavour eigenstates, B s and B s of this meson are not eigenstates of the weak Hamiltonian, an initial B s state will evolve into a mixture of B s and B s. The following complex matrix characterises this so called mixing : ( M11 i Γ 11 M 1 i Γ ) 1 M1 i Γ 1 M i Γ. (1.1) The mass and decay width differences between the mass eigenstates are denoted M s and Γ s, respectively. Violation of CP in mixing would be apparent as a flavour specific asymmetry, e.g., in semileptonic decays, a s sl Γ( B s µ + D s ) Γ(B s µ D + s ) Γ( B s µ + D s ) + Γ(B s µ D + s ) = Γ M tanφ 1, (1.) where φ 1 = arg( M 1 /Γ 1 ). The Standard Model predicts a very small value for φ 1 around. [1]. Therefore, the predicted value of a s sl = (1.9 ±.3) 1 is negligible compared to current experimental precision. A measurement that is significantly different from zero would be a strong indication of new physics. The D Collaboration reported an anomalously large asymmetry in the rate of like-sign muon pairs, A µµ = (.787 ±.17 stat ±.93 syst ) 1 []. This observable is a linear combination of the semileptonic asymmetries of the B s and B d systems: A µµ.6a s sl +.4ad sl. D have also recently measured the separate asymmetries [3, 4], and the results are consistent with the Standard Model. The most precise measurement of a d sl from the BaBar Collaboration [] is also consistent with the Standard Model. The measurement of a s sl with equation 1. requires flavour tagging to select wrong-sign decays. Without flavour tagging, the time integrated asymmetry is, A meas N(µ+ D s ) N(µ D + s ) N(µ + D s ) + N(µ D + s ) = as sl + K where a p is the production asymmetry, and [ ] a p as sl, (1.3) K = e Γ s t cos( M s t)ε(t)dt e Γ s t cosh( Γ s t/)ε(t)dt. (1.4) The production asymmetry arises due to the asymmetric (pp) initial state and the forward geometry of the detector, and has been measured to be around 1% for the B s [6]. Inserting the efficiency as a function of decay time, ε(t), and the mixing parameters for the B s, one obtains a value of K 1 3. A production asymmetry of even a few percent is thus washed out by the fast oscillations, to a level that is negligible compared to the statistical precision on A meas. The decay mode B s D s µ + ν µ X is used, with the D s decaying to φπ and φ K + K. In order to obtain A meas, the signal yields need to be corrected for any instrumental asymmetries.

3 . Dataset and event selection This analysis [7] is based on 1 fb 1 of pp collisions at s = 7 TeV, collected with the detector [8] during the 11 run of the LHC. is a single-arm forward spectrometer covering the pseudorapidity range < η <, designed for the study of particles containing b or c quarks. The magnet polarity is reversed periodically. Approximately 4% of the data were recorded with the magnetic field pointing up and the rest with the magnetic field pointing down. We exploit the fact that certain detection asymmetries cancel if data from different magnet polarities are combined. The trigger consists of a hardware stage (L), based on information from the calorimeter and muon systems, followed by a software stage (HLT) which applies a full event reconstruction. The offline selection requires a three track vertex, consistent with the decay D + s K + K π +. The D + s candidate must make a vertex with a muon that is consistent with the decay of a B s meson. All of the daughter particles must have a significant impact parameter with respect to the nearest primary vertex. The kaons must satisfy particle identification requirements and the kaon pair must have an invariant mass within ± MeV of the φ(1) resonance. Signal candidates are triggered by the muon at L and at the first stage of the HLT. The L muon trigger performs a fast reconstruction of muons, and requires a transverse momentum, p T, of at least 1.4 GeV (the exact threshold varied during the data taking period). The first HLT stage, HLT1, requires this muon to be confirmed in the tracking stations and to have a significant impact parameter with respect to the nearest primary vertex. In the final HLT stage, HLT, an inclusive, topological trigger for b hadron decays with a muon in the final state is used [9]. 3. Backgrounds Random combinatoric background is subtracted by fitting the K + K π ± invariant mass distribution. Figure 1 shows a fit to roughly half of the dataset, that was collected with the magnet polarity in the up configuration. The background from prompt D + s production is estimated to be around 3% from a two-dimensional fit to the mass and logarithm of the impact parameter of the D + s. The D + s production asymmetry has been measured to be (.33 ±. stat ±.11 syst ) 1 [1]. The effect of prompt D + s on the measured asymmetry is therefore considered to be negligible. A contamination of less than 1% is estimated from B s D + s X, with a hadron faking a muon. The fake rates are measured to have small asymmetries, so this background has a negligible effect on the measurement. The decay of B /B ± D ± s X c, where the second charm hadron, X c, decays semileptonically to produce a muon is estimated to contribute at the few percent level. The process B D + s K µ νx also contributes at the few percent level. Both of these sources inherit possible B and B ± production asymmetries of a percent at the most, but with opposite sign. A small systematic uncertainty is assigned to cover the residual asymmetry. 4. Instrumental asymmetries Any detection asymmetry is mostly cancelled by averaging the two magnet polarity configurations. Rather than to rely on this cancellation, dedicated control channels are used to measure the detection asymmetries, and separately correct the signal yields in each polarity. 3

4 Candidatess / 3 MeV (a) Candidatess / 3 MeV (b) Pull m(k K π + ) (MeV) m(k K π + ) (MeV) Pull m(k + K - π - ) (MeV) m(k + K - π - ) (MeV) Figure 1: The K + K π ± invariant mass distributions of the (a) D + s µ and (b) D s µ + candidates in the magnet-up dataset. ) - ε L(μ + ) / εl (μ Magnet Up Magnet Down Muon momentum [GeV] Figure : The L muon trigger efficiency ratio (µ + /µ ) as a function of the offline reconstructed muon momentum. The red and blue points correspond to the magnet-up and magnet-down data sets, respectively. Muon identification and trigger efficiency asymmetries are measured using J/ψ µ + µ candidates. Both muons are reconstructed in the tracking detectors, such that the full decay kinematics are determined, but only one (tag) muon is required to be identified in the muon stations. One can then study the efficiencies using the unbiased (probe) muon. Figure shows the L muon trigger efficiency ratio (µ + /µ ) as a function of the offline reconstructed muon momentum. For a single magnet polarity, an asymmetry of order 1% is observed, but is reasonably well compensated by the other polarity, as expected. In order to account for any kinematic dependence of the muon asymmetries, the measurement is performed in a bin grid of momentum, p x and p y. The J/ψ based muon corrections account for the offline muon identification, and the first two stages of the trigger. A partially reconstructed sample of D + D π + decays, with D K π + π + π, is used to determine the π + detection asymmetry, as detailed in Ref [1]. Since the muon and the pion have opposite charge, their tracking asymmetries are mostly cancelled. A residual asymmetry may 4

5 Table 1: Absolute systematic uncertainties in A meas. Source σ(a meas ) (%) Signal modelling.6 Background from other b hadrons. Tracking asymmetries.6 Kaon asymmetries. Muon corrections. Varying run conditions.1 Muon mis-identification.1 HLT biases. Statistical uncertainty in the muon corrections.1 Total.16 remain due to their different average momenta, and is accounted for in the systematic uncertainties. A possible asymmetry in HLT is studied using a sample of B D + µ νx candidates, with D + K π + π +. No significant asymmetry is found, and the upper limit is propagated to the systematic uncertainty.. Systematic uncertainties Table 1 lists the sources of systematic uncertainty on A meas. The largest component is the statistical uncertainty on the muon efficiency corrections, due to the limited J/ψ sample size. The next largest sources are from varying the signal fit parameterisation, and from the residual tracking asymmetries due to the different kinematics of the muon and the pion. 6. Results Figure 3 shows A meas as a function of the muon momentum, separately for the two magnet polarities and also for their average. Averaging over momentum we measure, a s sl = (.4 ±.4 stat ±.33 syst ) 1. Figure 4 compares this result to other measurements of a s sl and ad sl, plus the D measurement of A µµ. This is the most precise measurement to date and is in good agreement with the Standard Model prediction, and is therefore unable to confirm the anomaly seen by the D Collaboration. 7. Conclusions A recent measurement of the flavour specific CP violating asymmetry in B s decays, a s sl is presented. This measurement is based on the full 11 dataset of 1 fb 1 of pp collisions at s = 7 TeV, and uses a time integrated approach with untagged decays. The result, a s sl = (.4 ±.4 stat ±.33 syst ) 1, is the most precise measurement of this quantity to date, and is good agreement with Standard Model expectations. This result is unable to confirm the anomalous dimuon asymmetry reported by the D Collaboration.

6 (%) A meas 1 (a) (%) A meas 1 (b) (%) A meas 1 (c) Muon Momentum (GeV) Muon Momentum (GeV) Muon Momentum (GeV) Figure 3: A meas as a function of muon momentum for (a) magnet up, (b) magnet down, and (c) the average. References ) - (x1 a s sl SM B-factories D, 9. fb D, 1.4 fb D, 1.4 fb, 1. fb -4 - ad sl (x1 Figure 4: Comparison of the different measurements of a s sl and ad sl. [1] A. Lenz and U. Nierste, JHEP 76, 7 (7). [] D Collaboration, V. M. Abazov et al., Phys. Rev. D 84, 7 (11). [3] D Collaboration, V. M. Abazov et al., Phys. Rev. Lett. 11, 1181 (13). [4] D Collaboration, V. M. Abazov et al., Phys. Rev. D (1). [] BaBar Collaboration, J. P. Lees et al., arxiv:13.17 [hep-ex] (1). [6] Collaboration, R. Aaij et al., Phys. Rev. Lett. 18, 161 (1). [7] Collaboration, R. Aaij et al., -CONF-. [8] Collaboration, A. A. Alves Jr. et al., JINST 3 S8 (8). [9] V. Gligorov, C. Thomas, and M. Williams, -PUB16. [1] Collaboration, R. Aaij et al., Phys. Lett. B (1). - ) 6

PoS(CHARM2016)074. Searches for CPV in D + decays at LHCb

PoS(CHARM2016)074. Searches for CPV in D + decays at LHCb Università di Pisa and Sezione INFN di Pisa, Pisa, Italy E-mail: simone.stracka@cern.ch Singly-Cabibbo-suppressed D + decays are a good place to search for CP violation in charm, (s which in the Standard

More information

PoS(ICHEP2012)300. Electroweak boson production at LHCb

PoS(ICHEP2012)300. Electroweak boson production at LHCb Physik-Institut der Universität Zürich, Switzerland. E-mail: jonathan.anderson@cern.ch The electroweak boson production cross-sections have been measured in the forward region using s = 7 TeV proton-proton

More information

arxiv: v1 [hep-ex] 23 Jul 2013

arxiv: v1 [hep-ex] 23 Jul 2013 Semileptonic Mixing Asymmetry Measurements of A d SL and A s SL arxiv:1307.6114v1 [hep-ex] 23 Jul 2013 Martino Margoni 1 Università di Padova and INFN sezione di Padova Padova, ITALY Standard Model predictions

More information

Flavour Tagging at LHCb

Flavour Tagging at LHCb Flavour Tagging at LHCb Miriam Calvo Gomez, on behalf of the LHCb Collaboration Enginyeria La Salle Universitat Ramon Llull 822 Barcelona, SPAIN miriam.calvo@cern.ch 1 Introduction LHCb is a heavy flavour

More information

Muon reconstruction performance in ATLAS at Run-2

Muon reconstruction performance in ATLAS at Run-2 2 Muon reconstruction performance in ATLAS at Run-2 Hannah Herde on behalf of the ATLAS Collaboration Brandeis University (US) E-mail: hannah.herde@cern.ch ATL-PHYS-PROC-205-2 5 October 205 The ATLAS muon

More information

PoS(ICHEP2012)238. Search for B 0 s µ + µ and other exclusive B decays with the ATLAS detector. Paolo Iengo

PoS(ICHEP2012)238. Search for B 0 s µ + µ and other exclusive B decays with the ATLAS detector. Paolo Iengo Search for B s µ + µ and other exclusive B decays with the ATLAS detector. On behalf of the ATLAS Collaboration INFN Naples, Italy E-mail: paolo.iengo@cern.ch The ATLAS experiment, collecting data in pp

More information

AGH-UST University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland

AGH-UST University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland Central Exclusive Production at LHCb AGH-UST University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland E-mail: brachwal@agh.edu.pl The LHCb detector, with its

More information

W, Z and top production measurements at LHCb

W, Z and top production measurements at LHCb 1 W, Z and top production measurements at LHCb Lorenzo Sestini, on behalf of the LHCb collaboration. Universitá di Padova e INFN E-mail: lorenzo.sestini@cern.ch The LHCb experiment offers a complementary

More information

PoS(EPS-HEP2015)309. Electroweak Physics at LHCb

PoS(EPS-HEP2015)309. Electroweak Physics at LHCb European Organisation for Nuclear Research (CERN), Switzerland E-mail: william.barter@cern.ch LHCb s unique forward acceptance allows for complementary measurements of electroweak boson production to those

More information

PoS(CKM2016)087. Measurements of m d,s and Γ d at LHCb. Stefania Vecchi INFN, Sezione di Ferrara, Ferrara, Italy

PoS(CKM2016)087. Measurements of m d,s and Γ d at LHCb. Stefania Vecchi INFN, Sezione di Ferrara, Ferrara, Italy INFN, Sezione di Ferrara, Ferrara, Italy E-mail: vecchi@fe.infn.it In this proceedings the latest measurements of the mixing properties of the neutral B mesons performed by the collaboration are presented.

More information

Department of Physics and Astronomy, University of California, Riverside, CA, USA

Department of Physics and Astronomy, University of California, Riverside, CA, USA Recent results on charmless B meson decays from Babar Department of Physics and Astronomy, University of California, Riverside, CA, 92521 USA E-mail: bill.gary@ucr.edu Recent results from the Babar experiment

More information

The Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland. Rare B decays at CMS

The Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland. Rare B decays at CMS Available on CMS information server CMS CR -2017/115 The Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 17 April 2017 (v4, 10 May 2017) Rare

More information

Associated production with onia, double onia production at the LHC

Associated production with onia, double onia production at the LHC Associated production with onia, double onia production at the LHC Lancaster University E-mail: e.bouhova@cern.ch The most recent results on associated production with onia and double onia production at

More information

PoS(BEAUTY2016)023. Heavy flavour production at CMS. Giulia Negro. CEA/IRFU,Centre d etude de Saclay Gif-sur-Yvette (FR)

PoS(BEAUTY2016)023. Heavy flavour production at CMS. Giulia Negro. CEA/IRFU,Centre d etude de Saclay Gif-sur-Yvette (FR) CEA/IRFU,Centre d etude de Saclay Gif-sur-Yvette (FR) E-mail: giulia.negro@cern.ch hree recent results in heavy flavour production at the experiment are addressed in this report. Measurements of the differential

More information

Charm mixing and CP violation at LHCb

Charm mixing and CP violation at LHCb Charm mixing and CP violation at LHCb Alex Pearce on behalf of the LHCb collaboration 13 th 19 th March 216 Moriond EW, La Thuile 1 / 15 Introduction Why charm? Mixing and CP violation established in kaon

More information

LHCb: first results and prospects for the run

LHCb: first results and prospects for the run Journal of Physics: Conference Series : first results and prospects for the 1-11 run To cite this article: J P Palacios and the Lhcb Collaboration 1 J. Phys.: Conf. Ser. 9 1 View the article online for

More information

PoS(Kruger 2010)048. B X s/d γ and B X s/d l + l. Martino Margoni SLAC-PUB Universita di Padova and INFN

PoS(Kruger 2010)048. B X s/d γ and B X s/d l + l. Martino Margoni SLAC-PUB Universita di Padova and INFN SLAC-PUB-15491 B X s/d γ and B X s/d l + l Universita di Padova and INFN E-mail: martino.margoni@pd.infn.it Flavour Changing Neutral Current transitions B X s/d γ and B X s/d l + l provide an excellent

More information

PoS(DIS2014)183. Charmonium Production at ATLAS. S. Cheatham on behalf of the ATLAS Collaboration. McGill University

PoS(DIS2014)183. Charmonium Production at ATLAS. S. Cheatham on behalf of the ATLAS Collaboration. McGill University on behalf of the ATLAS Collaboration. McGill University E-mail: susan.cheatham@cern.ch Understanding of the production of P-wave charmonium states is a significant bottleneck in the understanding of charmonium

More information

Relative branching ratio measurements of charmless B ± decays to three hadrons

Relative branching ratio measurements of charmless B ± decays to three hadrons LHCb-CONF-011-059 November 10, 011 Relative branching ratio measurements of charmless B ± decays to three hadrons The LHCb Collaboration 1 LHCb-CONF-011-059 10/11/011 Abstract With an integrated luminosity

More information

PoS(EPS-HEP2015)544. b-flavour tagging in pp collisions. Alex Birnkraut TU Dortmund

PoS(EPS-HEP2015)544. b-flavour tagging in pp collisions. Alex Birnkraut TU Dortmund b-flavour tagging in pp collisions TU Dortmund E-mail: a.birnkraut@cern.ch In the system of neutral B mesons CP-violation and meson mixing can be measured using timedependent analyses, as performed at

More information

Heavy Hadron Production and Spectroscopy at ATLAS

Heavy Hadron Production and Spectroscopy at ATLAS Heavy Hadron Production and Spectroscopy at ALAS Carlo Schiavi on behalf of the ALAS Collaboration INFN Sezione di Genova ALAS has studied heavy flavor production and measured the production cross sections

More information

Determination of the phase φ s at LHCb

Determination of the phase φ s at LHCb Determination of the phase φ s at LHCb Varvara Batozskaya 1,, on behalf of the LHCb Collaboration 1 National Centre for Nuclear Research (NCBJ), Warsaw, Poland Abstract. The determination of the mixing-induced

More information

Search for H ± and H ±± to other states than τ had ν in ATLAS

Search for H ± and H ±± to other states than τ had ν in ATLAS Search for H ± and H to other states than τ had ν in On behalf of the collaboration Louisiana Tech University E-mail: Catrin.Bernius@cern.ch esults of searches for charged Higgs bosons based on data from

More information

Recent BaBar results on CP Violation in B decays

Recent BaBar results on CP Violation in B decays Journal of Physics: Conference Series OPEN ACCESS Recent BaBar results on CP Violation in B decays To cite this article: Arantza Oyanguren 2013 J. Phys.: Conf. Ser. 447 012029 View the article online for

More information

2! s measurement using B 0 s J/"# at LHCb

2! s measurement using B 0 s J/# at LHCb 2! s measurement using B 0 s J/"# at LHCb Géraldine Conti for the LHCb Collaboration EPFL, Lausanne E-mail: geraldine.conti@epfl.ch LPHE-2009-009 A measurement of the phase of the B 0 s B 0 s oscillation

More information

PoS(KAON)049. Testing the µ e universality with K ± l ± ν decays

PoS(KAON)049. Testing the µ e universality with K ± l ± ν decays University of Sofia "St. Kl. Ohridski" E-mail: Venelin.Kozhuharov@cern.ch The ratio R K = Γ(K ± e ± ν)/γ(k ± µ ± ν) provides a very powerful probe for the weak interactions structure. This ratio of decay

More information

arxiv: v1 [hep-ex] 24 May 2016

arxiv: v1 [hep-ex] 24 May 2016 EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN) Submitted to: JHEP CERN-PH-2016-085 9th October 2018 arxiv:1605.07485v1 [hep-ex] 24 May 2016 Measurement of the relative width difference of the B 0 B

More information

arxiv: v1 [hep-ex] 20 Jan 2013

arxiv: v1 [hep-ex] 20 Jan 2013 Heavy-Flavor Results from CMS arxiv:.69v [hep-ex] Jan University of Colorado on ehalf of the CMS Collaoration E-mail: keith.ulmer@colorado.edu Heavy-flavor physics offers the opportunity to make indirect

More information

PoS(EPS-HEP2017)662. Charm physics prospects at Belle II

PoS(EPS-HEP2017)662. Charm physics prospects at Belle II Dipartimento di Matematica e Fisica, Università di Roma Tre and INFN Sezione di Roma Tre, Via della vasca navale 84, I-00146 Rome, Italy E-mail: giacomo.depietro@roma3.infn.it Belle II is a major upgrade

More information

CP violation in mixing at LHCb CP violation in mixing at LHCb

CP violation in mixing at LHCb CP violation in mixing at LHCb CP violation in mixing at CP violation in mixing at J.A. de Vries on behalf of the collaboration OUTLINE Introduction asl d (5) asl s (new result) J.A. de Vries - CPV in mixing at - BEAUTY 6 CPV IN MIXING

More information

A. J. Schwartz Physics Department, University of Cincinnati, Cincinnati, Ohio USA

A. J. Schwartz Physics Department, University of Cincinnati, Cincinnati, Ohio USA Physics Department, University of Cincinnati, Cincinnati, Ohio 51 USA E-mail: alan.j.schwartz@uc.edu (on behalf of the Belle II Collaboration) The Belle II experiment is under construction at the KEK laboratory

More information

PoS(IHEP-LHC-2011)011

PoS(IHEP-LHC-2011)011 Laboratoire d Annecy-le-Vieux de Physique des Particules, Annecy-le-Vieux, France E-mail: Irina.Machikhiliyan@cern.ch LHC on the March, November 16-18, 2011 Protvino, Moscow region, Russian Federation

More information

Discovery searches for light new physics with BaBar

Discovery searches for light new physics with BaBar SLAC-PUB-1548 Discovery searches for light new physics with BaBar Neus Lopez-March BABAR Collaboration E-mail: neus.lopezmarch@epfl.ch The BABAR experiment collected large samples of events during the

More information

Heavy Flavour Physics at the LHC. Lessons from the first phase of the LHC DESY 27 September 2012

Heavy Flavour Physics at the LHC. Lessons from the first phase of the LHC DESY 27 September 2012 Heavy Flavour Physics at the LHC University of Warwick and CERN Lessons from the first phase of the LHC DESY 27 September 2012 1 Outline Heavy flavour production at the LHC The LHCb experiment Selected

More information

Identification of the Higgs boson produced in association with top quark pairs in proton-proton

Identification of the Higgs boson produced in association with top quark pairs in proton-proton Identification of the Higgs boson produced in association with top quark pairs in proton-proton collision: an analysis of the final state containing three leptons with the ATLAS detector Valentina Vecchio,

More information

Measurement of t-channel single top quark production in pp collisions

Measurement of t-channel single top quark production in pp collisions Measurement of t-channel single top quark production in pp collisions (on behalf of the CMS collaboration) INFN-Napoli & Università della Basilicata E-mail: Francesco.Fabozzi@cern.ch Measurements of t-channel

More information

Recent results from the LHCb experiment

Recent results from the LHCb experiment Recent results from the LHCb experiment University of Cincinnati On behalf of the LHCb collaboration Brief intro to LHCb The Large Hadron Collider (LHC) proton-proton collisions NCTS Wksp. DM 2017, Shoufeng,

More information

Results from combined CMS-TOTEM data

Results from combined CMS-TOTEM data Department of Physics Engineering, Hacettepe University, Ankara, Turkey The University of Iowa, Iowa City, USA E-mail: Sercan.Sen@cern.ch The combined data taking of the CMS and TOTEM experiments allows

More information

LHCb results in proton-nucleus collisions at the LHC

LHCb results in proton-nucleus collisions at the LHC LHCb results in proton-nucleus collisions at the LHC PANIC August 28, 2014 on behalf of the LHCb collaboration Outline Motivation LHCb Detector Beam configurations Measurements J/Ψ production Υ production

More information

Recent Heavy Flavors results from Tevatron. Aleksei Popov (Institute for High Energy Physics, Protvino) on behalf of the CDF and DØ Collaborations

Recent Heavy Flavors results from Tevatron. Aleksei Popov (Institute for High Energy Physics, Protvino) on behalf of the CDF and DØ Collaborations Recent Heavy Flavors results from Tevatron Aleksei Popov (Institute for High Energy Physics, Protvino) on behalf of the CDF and DØ Collaborations March 27, 2017 Outline Tevatron, CDF and DØ Confirmation

More information

PoS(DIS 2010)190. Diboson production at CMS

PoS(DIS 2010)190. Diboson production at CMS (on behalf of the CMS collaboration) INFN-Napoli & University of Basilicata E-mail: fabozzi@na.infn.it We present an analysis strategy based on Monte Carlo simulations for measuring the WW and WZ production

More information

Early physics with the LHCb detector

Early physics with the LHCb detector XXVIII PHYSICS IN COLLISION - Perugia, Italy, June, 25-28, 2008 Early physics with the LHCb detector Dirk Wiedner CERN for the LHCb collaboration 27 June 2008 Dirk Wiedner at PIC2008 Perugia 1 Outline

More information

CP Violation in the B(s) meson system at LHCb Julian Wishahi on behalf of the LHCb collaboration

CP Violation in the B(s) meson system at LHCb Julian Wishahi on behalf of the LHCb collaboration CP Violation in the B(s) meson system at Julian Wishahi on behalf of the collaboration 5th Rencontres de Moriond, Electroweak Session, 2th of March 215 CPV in Interference of Mixing/Decay interference

More information

B. Hoeneisen. Universidad San Francisco de Quito Representing the DØ Collaboration Flavor Physics and CP violation (2013)

B. Hoeneisen. Universidad San Francisco de Quito Representing the DØ Collaboration Flavor Physics and CP violation (2013) Status report on the like-sign dimuon charge asymmetry in p p collisions and Measurement of the direct CP asymmetry in B J/ψK and B J/ψπ decays B. Hoeneisen Universidad San Francisco de Quito Representing

More information

Highlights of top quark measurements in hadronic final states at ATLAS

Highlights of top quark measurements in hadronic final states at ATLAS Highlights of top quark measurements in hadronic final states at ATLAS Serena Palazzo 1,2,, on behalf of the ATLAS Collaboration 1 Università della Calabria 2 INFN Cosenza Abstract. Measurements of inclusive

More information

PERFORMANCE OF THE ATLAS MUON TRIGGER IN RUN 2

PERFORMANCE OF THE ATLAS MUON TRIGGER IN RUN 2 PERFORMANCE OF THE ATLAS MUON TRIGGER IN RUN 2 M.M. Morgenstern On behalf of the ATLAS collaboration Nikhef, National institute for subatomic physics, Amsterdam, The Netherlands E-mail: a marcus.matthias.morgenstern@cern.ch

More information

The Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland

The Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland Available on CMS information server CMS CR -2013/016 The Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 18 January 2013 (v2, 21 January 2013)

More information

Measurement of Фs, ΔΓs and Lifetime in Bs J/ψ Φ at ATLAS and CMS

Measurement of Фs, ΔΓs and Lifetime in Bs J/ψ Φ at ATLAS and CMS Measurement of Фs, ΔΓs and Lifetime in Bs J/ψ Φ at ATLAS and CMS Claudio Heller Excellence Cluster Universe LMU München For the ATLAS and CMS Collaborations Beauty 2013 14th International Conference on

More information

Overview of the Higgs boson property studies at the LHC

Overview of the Higgs boson property studies at the LHC Overview of the Higgs boson property studies at the LHC Giada Mancini, a, Roberto Covarelli b a LNF-INFN and University of Roma Tor Vergata, b INFN and University of Torino E-mail: giada.mancini@lnf.infn.it,

More information

Measurement of CP violation in B J/ψK 0 S. decays. Frank Meier TU Dortmund. XXIX Rencontres de Physique de la Vallée d Aoste March 1 7, 2015

Measurement of CP violation in B J/ψK 0 S. decays. Frank Meier TU Dortmund. XXIX Rencontres de Physique de la Vallée d Aoste March 1 7, 2015 Measurement of CP violation in B J/ψK S decays at LHCb Frank Meier TU Dortmund on behalf of the LHCb Collaboration XXIX Rencontres de Physique de la Vallée d Aoste March 1 7, 215 CP violation in the SM

More information

LHCb Overview. Barbara Storaci on behalf of the LHCb Collaboration

LHCb Overview. Barbara Storaci on behalf of the LHCb Collaboration LHCb Overview Barbara Storaci on behalf of the LHCb Collaboration CERN Council, December 14 th, 2012 Overview Introduction Collaboration Type of physics considered Detector Detector performances Selection

More information

Performance of muon and tau identification at ATLAS

Performance of muon and tau identification at ATLAS ATL-PHYS-PROC-22-3 22/2/22 Performance of muon and tau identification at ATLAS On behalf of the ATLAS Collaboration University of Oregon E-mail: mansoora.shamim@cern.ch Charged leptons play an important

More information

Physics with Tau Lepton Final States in ATLAS. Felix Friedrich on behalf of the ATLAS Collaboration

Physics with Tau Lepton Final States in ATLAS. Felix Friedrich on behalf of the ATLAS Collaboration Physics with Tau Lepton Final States in ATLAS on behalf of the ATLAS Collaboration HEP 2012, Valparaiso (Chile), 06.01.2012 The Tau Lepton m τ = 1.8 GeV, heaviest lepton cτ = 87 μm, short lifetime hadronic

More information

New physics searches via FCNC b s ll decays at ATLAS

New physics searches via FCNC b s ll decays at ATLAS New physics searches via FCNC b s ll at ATLAS Marcella (QMUL) on behalf of the ATLAS Collaboration UK Flavour Workshop Durham, UK September 5th, 2017 B physics in ATLAS very limited (wo)man power but a

More information

Mixing and CP violation

Mixing and CP violation Mixing and CP violation in the B s system with ATLAS Study from B s 0 J/ψ φ decay with and without flavour tagging Toyonobu OKUYAMA University of Tokyo On behalf of the ATLAS Collaboration PASCOS 2013

More information

LHCb: From the detector to the first physics results

LHCb: From the detector to the first physics results LHCb: From the detector to the first physics results Olivier Callot Laboratoire de l Accélérateur Linéaire, IN2P3/CNRS and Université Paris XI, Orsay, France On behalf of the LHCb collaboration In this

More information

Top quarks objects definition and performance at ATLAS

Top quarks objects definition and performance at ATLAS 5th International Workshop on op Quark Physics (OP) doi:.88/74-6596/45// op quarks objects definition and performance at ALAS V. Boisvert on behalf of the ALAS Collaboration Royal Holloway University of

More information

Determination of the CP-violating phase φ s in

Determination of the CP-violating phase φ s in Determination of the CP-violating phase φ s in B 0 s J/ψφ decays Varvara Batozskaya on behalf of the LHCb Collaboration National Centre for Nuclear Research (NCBJ), Warsaw, Poland The determination of

More information

Production of multiple electroweak bosons at CMS

Production of multiple electroweak bosons at CMS on behalf of the CMS Collaboration Northeastern University, Boston (USA) E-mail: daniele.trocino@cern.ch We present studies of diboson production in pp collisions at 7 TeV and 8 TeV center-of-mass energy

More information

UNIVERSITÀ DEGLI STUDI DI MILANO - BICOCCA DIPARTIMENTO DI FISICA G. OCCHIALINI CORSO DI DOTTORATO IN FISICA E ASTRONOMIA CICLO XXVII

UNIVERSITÀ DEGLI STUDI DI MILANO - BICOCCA DIPARTIMENTO DI FISICA G. OCCHIALINI CORSO DI DOTTORATO IN FISICA E ASTRONOMIA CICLO XXVII UNIVERSITÀ DEGLI STUDI DI MILANO - BICOCCA DIPARTIMENTO DI FISICA G. OCCHIALINI CORSO DI DOTTORATO IN FISICA E ASTRONOMIA CICLO XXVII Measurement of the branching fraction of B c + J/ψπ + π π + relative

More information

HQL Virginia Tech. Bob Hirosky for the D0 Collaboration. Bob Hirosky, UNIVERSITY of VIRGINIA. 26May, 2016

HQL Virginia Tech. Bob Hirosky for the D0 Collaboration. Bob Hirosky, UNIVERSITY of VIRGINIA. 26May, 2016 Bs CP-odd lifetime in Bs J/ψf0 and Afb for baryons at D0 2016 Virginia Tech Bob Hirosky for the D0 Collaboration 1 Tevatron Data D0 continues a rich physics program analyzing ~10fb-1 of recorded data from

More information

PoS(FPCP2017)018. CP violation in the baryon sector. Eluned Smith RWTH Aachen On behalf of the LHCb collaboration

PoS(FPCP2017)018. CP violation in the baryon sector. Eluned Smith RWTH Aachen   On behalf of the LHCb collaboration RWTH Aachen E-mail: eluned.anne.smith@cern.ch On behalf of the LHCb collaboration The study of violation in the baryon sector is still a relatively new field and offers the possibility to make many measurements

More information

(pp! bbx) at 7 and 13 TeV

(pp! bbx) at 7 and 13 TeV Measurement of (pp! bbx) at 7 and 13 TeV Matthew Kelsey on behalf of the LHCb collaboration 1 Motivation Measurements of charm and beauty cross-sections are some of the most interesting QCD studies that

More information

CMS Conference Report

CMS Conference Report Available on CMS information server CMS CR 2001/004 CMS Conference Report April 13, 2001 Prospects of B-Physics with CMS a) Sunanda Banerjee 1) Abstract Prospects of studies of properties of b flavoured

More information

Top production measurements using the ATLAS detector at the LHC

Top production measurements using the ATLAS detector at the LHC Top production measurements using the ATLAS detector at the LHC INFN, Sezione di Bologna and University of Bologna E-mail: romano@bo.infn.it This paper is an overview of recent results on top-quark production

More information

arxiv: v1 [hep-ex] 14 Oct 2011

arxiv: v1 [hep-ex] 14 Oct 2011 Proceedings of the DPF-211 Conference, Providence, RI, August 8-13, 211 1 Studies of b-hadron decays to charming final states at S. Ricciardi (on behalf of the Collaboration) STFC Rutherford Appleton Laboratory,

More information

The Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland

The Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland Available on CMS information server CMS CR -2017/094 The Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH211 GENEVA 23, Switzerland 18 March 2017 (v3, 20 March 2017) Recent

More information

PoS(KAON13)012. R K Measurement with NA62 at CERN SPS. Giuseppe Ruggiero. CERN

PoS(KAON13)012. R K Measurement with NA62 at CERN SPS. Giuseppe Ruggiero. CERN CERN E-mail: giuseppe.ruggiero@cern.ch A precision measurement of the ratio R K of the rates of kaon leptonic decays K e ν and K µ ν with the full minimum bias data sample collected with low intensity

More information

D 0 -D 0 mixing and CP violation at LHC

D 0 -D 0 mixing and CP violation at LHC D -D mixing and CP violation at LHC Patrick Spradlin on behalf of the LHCb collaboration University of O Particle P 5 th International Workshop on the CKM Unitarity Triangle Rome, Italy 9-13 September

More information

Review of Higgs results at LHC (ATLAS and CMS results)

Review of Higgs results at LHC (ATLAS and CMS results) Review of Higgs results at LHC (ATLAS and CMS results) Università degli Studi di Genova and INFN, Genova, Italy E-mail: andrea.favareto@ge.infn.it The status of Higgs sector studies at the Large Hadron

More information

Dilepton Forward-Backward Asymmetry and electroweak mixing angle at ATLAS and CMS

Dilepton Forward-Backward Asymmetry and electroweak mixing angle at ATLAS and CMS Dilepton Forward-Backward Asymmetry and electroweak mixing angle at ATLAS and CMS University of Rochester E-mail: jyhan@fnal.gov We present measurements of the forward-backward asymmetry in Drell-Yan dilepton

More information

The Compact Muon Solenoid Experiment. CMS Note. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland. CMS prospects for heavy flavour physics

The Compact Muon Solenoid Experiment. CMS Note. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland. CMS prospects for heavy flavour physics Available on CMS information server CMS NOTE -2011/008 The Compact Muon Solenoid Experiment CMS Note Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 10 November 2011 (v2, 14 November 2011) CMS

More information

Measurements of CPV and mixing in charm decays

Measurements of CPV and mixing in charm decays Measurements of CPV and mixing in charm decays on behalf of LHCb Collaboration Moriond QCD La Thuile, Italy March 21 28, 2015 Charm and New Physics In indirect searches for new physics, charm furnish a

More information

Measurements of R K and R K* at LHCb

Measurements of R K and R K* at LHCb Measurements of R K and R K* at LHCb Marie-Hélène Schune Laboratoire de l Accélérateur Linéaire, Orsay On behalf of the LHCb Collaboration B K* (K π) e + e - candidate Instant Workshop on B meson anomalies,may

More information

arxiv: v2 [hep-ex] 8 Aug 2013

arxiv: v2 [hep-ex] 8 Aug 2013 -PROC-13-6 May 11, 1 Studies of charmless B decays including CP violation effects arxiv:138.7v [hep-ex] 8 Aug 13 Irina Nasteva 1 Centro Brasileiro de Pesquisas Físicas Rio de Janeiro, Brazil The latest

More information

Search for Lepton Number Violation at LHCb

Search for Lepton Number Violation at LHCb Search for Lepton Number Violation at LHCb Update for Majorana Neutrino Search with Like-Sign Di-Muons: B π + μ μ decay P R E L I M I N A R Y, presented for the first time Bartłomiej Rachwał (IFJ PAN Kraków)

More information

Search for non-standard and rare decays of the Higgs boson with the ATLAS detector

Search for non-standard and rare decays of the Higgs boson with the ATLAS detector Search for non-standard and rare decays of the Higgs boson with the ATLAS detector IFAE Barcelona, Spain E-mail: gerbaudo@cern.ch At the LHC, searches for rare and exotic decays of the Higgs boson constitute

More information

Recent results from rare decays

Recent results from rare decays Recent results from rare decays Jeroen van Tilburg (Physikalisches Institut Heidelberg) Don t worry about the number of slides: Only half of them is new Advanced topics in Particle Physics: LHC physics,

More information

Electroweak Measurements at LHCb!

Electroweak Measurements at LHCb! Electroweak Measurements at LHCb! Simone Bifani University of Birmingham (UK) on behalf of the LHCb collaboration LHCb workshop on quantum interference effects, QCD measurements and generator tuning CERN,

More information

arxiv: v3 [hep-ex] 11 Feb 2013

arxiv: v3 [hep-ex] 11 Feb 2013 q/p Measurement from B 0 D lν Partial Reconstruction arxiv:1301.0417v3 [hep-ex] 11 Feb 2013 Martino Margoni on behalf of the BaBar Collaboration Università di Padova and INFN sezione di Padova Padova,

More information

PoS(CKM2016)117. Recent inclusive tt cross section measurements. Aruna Kumar Nayak

PoS(CKM2016)117. Recent inclusive tt cross section measurements. Aruna Kumar Nayak Recent inclusive tt cross section measurements Institute of Physics, Bhubaneswar, India E-mail: Aruna.Nayak@cern.ch Results of the recent measurements for the inclusive tt production cross section in the

More information

arxiv: v1 [hep-ex] 14 Sep 2015

arxiv: v1 [hep-ex] 14 Sep 2015 WSU HEP XXYY September 5, 5 arxiv:59.3v [hep-ex] Sep 5 Search for CP violation in D K + K, π + π and D π π Tara Nanut Department for Experimental Particle Physics Jozef Stefan Institute, Jamova 39, Ljubljana,

More information

Tau (or no) leptons in top quark decays at hadron colliders

Tau (or no) leptons in top quark decays at hadron colliders Tau (or no) leptons in top quark decays at hadron colliders Michele Gallinaro for the CDF, D0, ATLAS, and CMS collaborations Laboratório de Instrumentação e Física Experimental de Partículas LIP Lisbon,

More information

Two Early Exotic searches with dijet events at ATLAS

Two Early Exotic searches with dijet events at ATLAS ATL-PHYS-PROC-2011-022 01/06/2011 Two Early Exotic searches with dijet events at ATLAS University of Toronto, Department of Physics E-mail: rrezvani@physics.utoronto.ca This document summarises two exotic

More information

(Towards) First Physics with LHCb

(Towards) First Physics with LHCb (Towards) First Physics with LHCb Beam induced splash in LHCb Physics at LHC 2008 Split, Croatia, 29 Sep - 4 Oct 2008 Introduction Detector overview and performance Extracting physics from (very) first

More information

Open heavy-flavour production in pp, p Pb and Pb Pb collisions in ALICE

Open heavy-flavour production in pp, p Pb and Pb Pb collisions in ALICE Open heavy-flavour production in pp, p Pb and Pb Pb collisions in ALICE (INFN, Bologna) on behalf of the ALICE Collaboration Bormio Winter Meeting 26/01/2018 Why open heavy flavour in ALICE? Heavy-flavour

More information

2 The ATLAS Experiment at the Large Hadron Collider at CERN

2 The ATLAS Experiment at the Large Hadron Collider at CERN Studies of the Di-Muons Resonances at the ATLAS Experiment at CERN PhD Detailed Research Project PhD Candidate: Camilla Maiani Supervisor: Prof. Carlo Dionisi, Dott. Stefano Giagu Università di Roma La

More information

Top quark pair properties in the production and decays of t t events at ATLAS

Top quark pair properties in the production and decays of t t events at ATLAS ATL-PHYS-PROC-214-72 11 July 214 Top quark pair properties in the production and decays of t t events at DESY, Hamburg Universität Wuppertal E-mail: ralph.schaefer@cern.ch In proton-proton collisions at

More information

CP Violation Studies at DØ

CP Violation Studies at DØ CP Violation Studies at DØ Bd Bs Bd Bs Rick Van Kooten Indiana University For the DØ Collaboration LHCP 13 Barcelona, Spain 13 18 May 13? CP Violation Three kinds: In mixing: Mass eigenstates in mesonic

More information

Radiative penguins at hadron machines. Kevin Stenson! University of Colorado!

Radiative penguins at hadron machines. Kevin Stenson! University of Colorado! Radiative penguins at hadron machines Kevin Stenson! University of Colorado! Introduction γ + b q u,c,t W s q b q u,c,t W + s q b q ν W W + u,c,t s q!! Radiative penguins involve b to s,d transitions with

More information

Measurement of charged particle spectra in pp collisions at CMS

Measurement of charged particle spectra in pp collisions at CMS Measurement of arged particle spectra in pp collisions at CMS for the CMS Collaboration Eötvös Loránd University, Budapest, Hungary E-mail: krisztian.krajczar@cern. We present the plans of the CMS collaboration

More information

Measurement of the baryon number transport with LHCb

Measurement of the baryon number transport with LHCb Measurement of the baryon number transport with LHCb Marco Adinolfi University of Bristol On behalf of the LHCb Collaboration 13 April 2011 / DIS 2011 Marco Adinolfi DIS 2011-13 April 2011 - Newport News

More information

Recent CP violation measurements

Recent CP violation measurements Recent CP violation measurements 1/38 Recap of last week What we have learned last week: Indirect searches (CP violation and rare decays) are good places to search for effects from new, unknown particles.

More information

Results on heavy ion collisions at LHCb

Results on heavy ion collisions at LHCb Results on heavy ion collisions at LHCb Marcin Kucharczyk on behalf of LHCb collaboration HNI Krakow 28th Rencontres de Blois 29.05-03.06 2016 Outline LHCb - general purpose forward experiment Physics

More information

The search for standard model Higgs boson in ZH l + l b b channel at DØ

The search for standard model Higgs boson in ZH l + l b b channel at DØ The search for standard model Higgs boson in ZH l + l b b channel at DØ University of Science and Technology of China E-mail: pengj@fnal.gov on behalf of the DØ collaboration We present a search for the

More information

PoS(ICHEP2012)049. Study of tau-pair production at HERA. Masaki Ishitsuka Tokyo Institute of Technology

PoS(ICHEP2012)049. Study of tau-pair production at HERA. Masaki Ishitsuka Tokyo Institute of Technology Tokyo Institute of Technology E-mail: ishitsuka@phys.titech.ac.jp for ZEUS Collaboration A study of tau-pair production has been performed with the ZEUS detector at HERA ep collider, using a data sample

More information

Searches for BSM Physics in Rare B-Decays in ATLAS

Searches for BSM Physics in Rare B-Decays in ATLAS Searches for BSM Physics in Rare B-Decays in ATLAS Iskander Ibragimov on behalf of the ATLAS Collaboration SUSY 14 The nd International Conference on Supersymmetry and Unification of Fundamental Interactions

More information

Measurement of Properties of Electroweak Bosons with the DØ Detector

Measurement of Properties of Electroweak Bosons with the DØ Detector Measurement of Properties of Electroweak Bosons with the DØ Detector Laboratoire de Physique Subatomique et de Cosmologie, 53, rue des Martyrs, 38026, Grenoble Cedex, France. E-mail: Hengne.Li@in2p3.fr

More information

arxiv: v1 [hep-ex] 18 Jul 2016

arxiv: v1 [hep-ex] 18 Jul 2016 Top quark mass measurements with the experiment at the LHC arxiv:67.4972v [hep-ex] 8 Jul 26 Deutsches Elektronen-Synchrotron DESY E-mail: simon.spannagel@desy.de Measurements of the top quark mass are

More information

Recent results from the LHCb

Recent results from the LHCb PLANCK 2017 AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY Bartłomiej Rachwał (AGH Kraków) on behalf of LHCb collaboration Recent results from the LHCb 20 th Planck Conference physics beyond the Standard Model

More information